The first four images are from Forever and Sending SOS. The last two are from my last two uploads, somehow one is fine while the other one got compressed a lot. The old Forever and Sending SOS m4a were downloaded in 7/2014, downloaded 720p mp4 (with youtube-dl) then extracted losslessly (with Maruki Toolbox). I even tried --all-formats in youtube-dl to download a better version of the 'new' audio, yet the best is only 126 kbps from 720p or webm, both worse than the old m4a from old 720p.
OR it's just I (keepvid.com and youtube-dl) can't access to the 192 kbps audio for me to download while a normal user can access to it in a browser.